US PATENT SUBCLASS 251 / 1.2
.~ Deformable annulus

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

1.1  DF  BLOW-OUT PREVENTERS (I.E., COOPERATING SEGMENTS OF ANNULUS) {2}
1.2.~ Deformable annulus

DEFINITION

Classification: 251/1.2

Deformable annulus:

(under subclass 1.1) Subject matter wherein one of the flow obstructing members comprises an annular member capable of having its shape changed by application of a force to thereby control flow through the annular flow passage.